HACKS revision 1.43
1 # $NetBSD: HACKS,v 1.43 2005/04/05 11:56:09 tron Exp $ 2 # 3 # This file is intended to document workarounds for currently unsolved 4 # (mostly) compiler bugs. 5 # 6 # Format: 7 # hack title 8 # cdate creation date 9 # mdate mod date 10 # who responsible developer 11 # port ... 12 # affected ports, space separated, if not "all" 13 # file affected file : revision : line from : line to 14 # affected files and revision and line numbers describing hack 15 # multiple lines if necessary. 16 # pr NNNN ... 17 # problem reports this hack works around, if known. Space 18 # separated. 19 # regress src/regress/directory/where/test/found 20 # regression test directories, if available. 21 # descr 22 # insert short informal description (multi-line). (Longer ones 23 # should be in the PR database. More formal descriptions might 24 # be in the regress tree. See above). 25 # kcah 26 # closing bracket. 27 # 28 # this is a comment. 29 30 hack netstat ieee1394 address printing. 31 mdate 14 Nov 2000 32 who matt 33 file lib/libc/net/getnameinfo.c : 1.32 : 497 : 503 34 descr 35 Because the current implementation of IP over IEEE1394, the 36 fw device address contains more than just the IEEE1394 EUI-64. 37 So when printing out IEEE1394 addresses, ignore the extra stuff. 38 kcah 39 40 hack xterm vs. libterm 41 mdate 01 Aug 2000 42 who jdc 43 file xsrc/xc/programs/xterm/main.c : 1.2 : 3609 : 3614 44 pr 10383 45 descr 46 In order to extend the termcap string over 1023 bytes, a ZZ entry was 47 introduced to point to a memory location containing the full entry. 48 Without this hack, xterm will export a termcap containing the ZZ 49 entry, which will then be ignored by libterm. As xterm modifies the 50 exported termcap, this would cause those modifications to be ignored. 51 kcah 52 53 hack wi-at-big-endian-bus 54 cdate 15 Mar 2002 55 who martin 56 file dev/ic/wireg.h 57 descr Add an option to access the underlying bus in big endian byte order 58 to work around deficiencies in bus_space_{read,write}_* macros. 59 Those don't allow the implementation of a proper pcmcia bus space 60 tag. 61 kcah 62 63 hack specific knowledge of colours in curses code 64 cdate Sun Apr 6 11:05:24 BST 2003 65 who jdc 66 file lib/libcurses/color.c : r1.24 67 descr 68 Swap red/blue and yellow/cyan colours for COLOR_OTHER. 69 Fix is to enhance libtermcap to understand terminfo-style % sequences. 70 See also: 71 http://mail-index.NetBSD.org/tech-userlevel/2003/04/06/0000.html 72 kcah 73 74 hack Compensation for differing types of LINUX_USRSTACK and USRSTACK 75 cdate 21 Aug 2003 76 who he 77 file sys/miscfs/procfs/procfs_linux.c : 1.14 78 descr 79 Not all ports have LINUX_USRSTACK and/or USRSTACK defined as 80 literals/constants, but refer to variables of a type which is 81 not "unsigned long", causing compilation of procfs_linux.c to 82 fail with "makes integer from pointer without a cast". This 83 is observed on e.g. the sun3 port. Ideally the "types" for 84 symbols should be consistent across all ports. 85 kcah 86 87 hack GCC2 isn't C99 88 cdate 5 December 2003 89 who mrg 90 file gnu/dist/binutils/ld/ldlex.c: r1.2 91 descr 92 ldlex.c is generated from ldlex.l and we get macro redefinition 93 errors from it if __STDC_VERSION__ is not C99 compliant. This 94 hack forces NetBSD 1.6 and later systems to also include <stdint.h> 95 to get the relevant definitions. This hack should be backed out 96 when all platforms have switched away from GCC2. 97 kcah 98 99 hack gcc-strict-aliasing 100 cdate 6 August 2004 101 who junyoung 102 pr 26516 103 file src/usr.sbin/racoon/racoon/Makefile : 1.21 104 descr 105 GCC issues a warning "dereferencing type-punned pointer will break 106 strict-aliasing rules" when compiling 107 crypto/dist/kame/racoon/crypto/openssl.c with -O[23s]. Note that this 108 is due to use of type casting in a non-standard way in the code and 109 not a compiler bug. Once a new release of KAME with a proper fix 110 applied is imported this should be backed out. 111 kcah 112 113 114 port vax 115 116 hack gcc 2.95/vax cannot handle __builtin_ffs() 117 cdate Fri Aug 23 21:31:15 CEST 2002 118 who ragge 119 file sys/lib/libkern/libkern.h : 1.42 120 descr 121 __builtin_ffs() is ifdef'd away if __vax__. Matt Thomas has 122 added this feature to GCC 3 so it can be removed when switching. 123 kcah 124 125 hack gcc-vax-libbz2 126 mdate 27 Jun 2002 127 who thorpej 128 file lib/libbz2/Makefile 129 descr 130 libbz2 is mis-compiled with optimization with GCC 2.95.3 131 on VAX. -O0 works around this problem. 132 kcah 133 134 hack gawk 135 mdate 8 Nov 2003 136 who ragge 137 file gnu/usr.bin/gawk/Makefile 138 descr 139 gawk is mis-compiled with optimization with GCC 2.95.3 140 on VAX. -O0 works around this problem. 141 kcah 142 143 hack vax Toolchain bug 144 cdate 28 Mar 2003 145 who he 146 file sys/arch/vax/vax/intvec.S : 1.5 147 descr 148 Workaround for PR toolchain/20924. The assembler apparently 149 tries to range-check byte offsets when it doesn't have 150 sufficient information to make that decision. 151 Workaround uses `brw' instead of `brb' instruction. 152 kcah 153 154 hack vax gcc 2.95.3 -Wuninitialized workarounds 155 cdate 6 Nov 2003 156 who he 157 file sys/dev/bi/if_ni.c : 1.22 158 file sys/arch/vax/vax/ctu.c : 1.20 159 descr 160 Workaround for gcc 2.95.3 failing to detect that certain 161 variables will be initialized; so that this code compiles 162 with -Wuninitialized. Should be reviewed and possibly 163 reverted when gcc 3.3.2 is ready for vax. 164 kcah 165 166 hack vax gcc 2.95.3 structure initialization 167 cdat 13 May 2004 168 who cl 169 file sys/miscfs/kernfs/kernfs_vnops.c : 1.104 170 descr 171 Workaround for gcc 2.95.3 failing to initialize structures 172 and/or unions inside structures using nested designators. 173 Should be reverted when gcc >=3.3.3 is ready for vax. 174 kcah 175 176 hack vax gcc 2.95.3 needs -I. to build nslexer.c 177 cdat 6 Jun 2004 178 who mhitch 179 file lib/libc/arch/vax/Makefile.inc : 1.6 180 descr 181 It appears necessary to add -I. to CPPFLAGS when building 182 nslesxer.c. This may be caused by gcc 2.95.3 being used. 183 Should be reverted when a newer gcc is ready for vax. 184 kcah 185 186 hack vax gcc 2.95.3 doesn't understand "-std=c99" 187 cdat 5 April 2005 188 who tron 189 file src/share/mk/bsd.sys.mk 190 descr 191 We cannot use "-std=c99" for compiler warning level 4 and above 192 because gcc 2.95.3 doesn't support that option. 193 kcah 194 195 port sparc64 196 197 hack binutil-2.11-sparc64-pltrela 198 mdate 14 Aug 2001 199 who eeh 200 file libexec/ld.elf_so/arch/sparc64/mdreloc.c 201 descr 202 The first four PLT entries are reserved. There is some 203 disagreement whether they should have associated relocation 204 entries. Both the SPARC 32-bit and 64-bit ELF specifications 205 say that they should have relocation entries, but the 32-bit 206 SPARC binutils do not generate them, and now the 64-bit SPARC 207 binutils have stopped generating them too. 208 209 To provide binary compatibility, we will check the first entry, 210 if it is reserved it should not be of the type JMP_SLOT. If it 211 is JMP_SLOT, then the 4 reserved entries were not generated and 212 our index is 4 entries too far, so we frob the rela pointer. 213 kcah 214 215 216 port arm 217 218 hack gcc-unsigned-compare 219 cdate 09 Mar 2002 220 mdate 18 Mar 2002 221 who bjh21 222 file dist/bind/lib/nameser/ns_parse.c : 1.3 223 file dist/dhcp/minires/ns_parse.c : 1.3 224 file dist/dhcp/omapip/result.c : 1.2 225 file dist/dhcp/server/failover.c : 1.3 226 file gnu/dist/gawk/eval.c : 1.4 227 file gnu/dist/toolchain/bfd/bfd.c : 1.2 228 file gnu/dist/toolchain/bfd/format.c : 1.2 229 file gnu/dist/toolchain/gdb/target.c : 1.2 230 file sys/kern/vfs_subr.c : 1.172 231 descr When checking that a potentially-unsigned enum is >= 0, assign 232 it to an int first. This is necessary to avoid "comparison is 233 always true" warnings with -fshort-enums. Casting to an int 234 really should be enough, but turns out not to be. 235 kcah 236 237 hack gcc 3.3.2/arm sys/kern/uipc_socket.c 238 cdate Tue Oct 28 18:02:16 GMT 2003 239 who skrll 240 pr 23044 241 file sys/arch/arm/conf/Makefile.arm : 1.19 242 descr 243 Performing a build.sh tools on a CATS with NFS mounted 244 obj and src directories results in "panic: receive 1" 245 The hack is to compile sys/kern/uipc_socket.c with 246 -fno-strict-aliasing 247 kcah 248 249 250 port pc532 251 252 hack egcs-pc532-ip6_mroute 253 cdate 09 Jul 2002 254 who simonb 255 file sys/arch/pc532/conf/Makefile.pc532 : 1.70 256 file sys/arch/pc532/conf/files.pc532 : 1.47 257 descr 258 egcs 1.1.2 gets an "internal error--insn does not satisfy its 259 constraints" error compiling ip6_mroute.c with -O2 or greater. 260 -O1 works around this problem. 261 kcah 262 263 hack gcc-pc532-duffs_device 264 cdate Mon Oct 27 07:23:05 UTC 2003 265 who simonb 266 file sys/arch/pc532/conf/Makefile.pc532 : 1.71 267 file sys/arch/pc532/conf/files.pc532 : 1.52 268 pr GCC PR optimization/5230 269 descr 270 gcc incorrectly gives an "unreachable code at beginning of 271 switch statement" for a Duff's device construct in 272 arch/pc532/dev/ncr.c. There is no way to disable just this 273 warning, so -Wno-error is turned on for this file. 274 kcah 275 276 hack gcc332-cppmacro-ice 277 cdate Sun Dec 7 12:48:33 UTC 2003 278 who simonb 279 file gnu/usr.bin/gcc3/libcpp/Makefile : 1.2 280 descr 281 gcc 3.3.2 gets an ICE when compiling cppmacro.c with -O2. 282 The hack is to use -O1 for this file. Fixed in gcc 283 -current mainline, unable to work out where the fix is 284 right now. 285 kcah 286 287 288 port sh3 289 290 hack gcc-sh3-sed 291 mdate 23 Apr 2002 292 who thorpej 293 file usr.bin/sed/Makefile : 1.9 : 9 : 13 294 descr 295 The in-tree GCC 2.95.3-based compiler ICEs when building 296 with optimization for SuperH. Hack is to build with -O0. 297 kcah 298 299 300 port sh5 301 302 hack SuperH SH5 Toolchain Bugs 303 cdate 11 Jul 2002 304 who scw 305 file usr.sbin/ndbootd/ndbootd.c : 1.6 306 file usr.sbin/traceroute/traceroute.c : 1.48 307 descr 308 The SuperH SH5 toolchain (2.97-sh5-010522) gets an internal 309 compiler error when assigning a bit-wise inverted value 310 under some circumstances. 311 Work around it by splitting the statement into two. 312 kcah 313 314 hack SuperH SH5 Toolchain Bugs 315 cdate 17 May 2003 316 who scw 317 file lib/libpthread/pthread_lock.c : 1.7 318 descr 319 The SuperH SH5 toolchain generates incorrect PIC code when 320 faced with a symbol which is declared extern, but has local 321 scope due to being defined within an asm() statement (without 322 being declared .globl in that statement). Work around it by 323 adding the .globl. 324 kcah 325 326 hack gcc 3.3.2 on sh5 - ICE compiling reload1.c at -O2 327 cdate Sun Dec 7 19:44:05 GMT 2003 328 who scw 329 file gnu/usr.bin/gcc3/backend/Makefile : 1.13 330 descr 331 Gcc3 for sh5 gets an ICE compiling reload1.c at -O2. 332 Drop to -O1 for now when building for sh5. 333 kcah 334 335 hack gcc 3.3.2 on sh5 - ICE compiling elf32.c/elf64.c at -O2 336 cdate Sun Dec 7 21:10:46 GMT 2003 337 who scw 338 file gnu/lib/libbfd/Makefile : 1.39 339 descr 340 Gcc3 for sh5 gets an ICE compiling libbfd's elf32.c 341 and elf64.c at -O2. 342 Drop to -O1 for now when building for sh5. 343 kcah 344 345 346 hack gcc 3.3.2 on sh5 - fatal warning compiling function.c 347 cdate Sun Dec 7 19:44:05 GMT 2003 348 who scw 349 file gnu/usr.bin/gcc3/backend/Makefile : 1.13 350 descr 351 Gcc3 for sh5 issues a warning: 352 .../gnu/dist/gcc/gcc/function.c:4742: warning: `and' of 353 mutually exclusive equal-tests is always 0. 354 This causes the build to fail because of -Werror. 355 Work-around by defining NOGCCERROR when building for sh5. 356 kcah 357 358 hack gcc 3.3.3 on sh5 - ICE compiling rbtdb.c and rbtdb64.c 359 cdate Thu Nov 11 00:35:33 UTC 2004 360 who he 361 file usr.sbin/bind/libdns/Makefile/1.2 362 descr 363 Gcc3 for sh5 gets an ICE compiling these files at -O2. 364 Drop to -O1 for now when building for sh5. 365 kcah 366 367 368 port sun2 369 370 hack gcc 3.3.2/mdsetimage 371 cdate Tue Oct 28 18:43:05 EST 2003 372 who fredette 373 file gnu/usr.sbin/mdsetimage/Makefile : 1.15 374 descr 375 mdsetimage.c causes cc1 to barf for as-yet unknown reasons. 376 this hack uses -O0 to avoid the problem. 377 kcah 378 379 hack gcc 3.3.2/installboot/ffs.c 380 cdate Tue Oct 28 18:43:05 EST 2003 381 who fredette 382 file usr.sbin/installboot/Makefile : 1.26 383 descr 384 ffs.c causes cc1 to barf for as-yet unknown reasons. this 385 hack uses -O0 to avoid the problem. 386 kcah 387 388 389 port sun2, m68k 390 391 hack gcc 3.3.2/gcc/ra-colorize.c 392 cdate Wed Nov 5 11:03:13 EST 2003 393 who mrg 394 file gnu/usr.bin/gcc/backend/Makefile : 1.11 395 descr 396 ra-colorize.c causes a whole spew of unreferenced .L* local 397 symbols. using -O0 (or even -O2 reportedly) avoids the problem. 398 kcah 399 400 port sparc64 401 402 hack disable optimzations for uvm_bio.c on 32 bit kernels 403 cdate Sun Mar 21 14:14:04 MET 2004 404 who martin 405 file sys/arch/sparc64/conf/Makefile.sparc64 : 1.53-1.54 406 file sys/arch/sparc64/conf/files.sparc64 : 1.93 407 descr 408 The sparc compiler miscompiles uvm_bio.c when using 409 any optimization. This results in ubc_release panics. 410 kcah 411 412 port macppc 413 414 hack remove inline from rotate_{left,right} 415 cdate Tue Feb 22 13:43:25 EST 2005 416 who christos 417 file src/dist/bind/lib/dns/rbt.c 418 descr 419 The macppc gcc-3.3 compiler miscompiles rbt.c when these 420 functions are inlined. The error is: 421 .* named[368]: rbt.c:1584: INSIST(child != (void *)0) >failed 422 .* named[368]: exiting (due to assertion failure) 423 This is reportedly fixed in gcc-3.4 424 kcah 425
Indexes created Wed Nov 05 21:10:10 GMT 2025